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I have a large set of slip joint pliers that I place jaws up in the vice and engage into that large nut up the base of the jar. Here is a link to a photo on an auction site local to me to show what the pliers I use look like, it's the New Zealand eBay equivalent site.
http://www.trademe.co.nz/building-renovation/tools/hand-tools/pliers/auction-817772271.htm
Or just get the "Right" tool, to do the Right Job, the Right way...
Vitamix Wrench
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